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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);
- cout.tie(0);
- vector<int>a,ans;
- int n,c,i,j,k;
- cin>>n>>k;
- for(i=0; i<n; i++)
- {
- cin>>c;
- a.push_back(c);
- if(i) ans.push_back(a[i]-a[i-1]);
- }
- sort(ans.begin(),ans.end());
- while(k>1)
- {
- ans.pop_back();
- k--;
- }
- j=0;
- for(i=0; i<ans.size(); i++)
- {
- j+=ans[i];
- }
- cout<<j<<endl;
- return 0;
- }
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